"Let’s tax them out of existence instead."
We can only do that if we accept that we don't need them to fund our economy, which we don't. Until we understand that capital is a product of the state, and that the state has an unlimited supply of it, the capitalist elite will be able to blackmail the working class into submission.
The fear of unemployment with no backstop for the worker is maintained by our misguided monetary policy and the rhetoric of politicians from both parties, as well as a unified message from our corporate media. Just the concept of a currency issuing government "needing" funding from taxation or borrowing is enough to stymy any security for the working class.